Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Jerry Gaffke

OK, so IF-Shift is just a BFO offset (relative to the crystal filter passband) 
that is for receive only, the transmit BFO offset generally stays put.
Makes sense.

I went off into the weeds there because Gerald's original query stated that
In LSB I can adjust the received sound with the IF-Shift with a
> very pleasing effect,
but this does not work the same with USB.

Sounded like there was something more going on.
But could be just that the code didn't quite handle the USB case correctly.

Yes, eventually I'll move on to try some of the newer software.
But for now have my hands full with other projects.


On Sat, Mar 10, 2018 at 02:49 pm, Mike Woods wrote:
Most commercial rigs have an IF Shift or Passband Tuning (PBT) control.  This control can help with removal of QRM on receive ( eliminating a strong carrier or another station on the edge of the passband by shifting the passband up or down by a few 100 Hz. It can also compensate for a poorly adjusted frequency response on a signal that is being received (too bassy or too trebly). 
Ian’s software implements just such a control.  It functions in a similar manner to the BFO calibration routine, in fact, but unlike the calibration function, it should only operate on RX. This was the bug - it didn’t turn off on TX.  I checked on my uBITx and found the same problem here.
If you haven’t tried the KD8CEC firmware you should.  It has a number of other worthwhile software features!

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